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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tính: 3) x ³ + 8 4) x ³ + 64 5) x ³ + 125 8) x ³ – 8 9) 64 – x ³ 10) 125 – x ³ 11) 8x ³ – y ³

Toán Lớp 8: Tính:
3) x ³ + 8
4) x ³ + 64
5) x ³ + 125
8) x ³ – 8
9) 64 – x ³
10) 125 – x ³
11) 8x ³ – y ³

Comments ( 2 )

  1. Bài làm :
    3, 
    x^3+8
    =x^3+2^3
    =(x+2)(x^2-2x+4)
    4, 
    x^3+64
    =x^3+4^3
    =(x+4)(x^2-4x+16)
    5, 
    x^3+125
    =x^3+5^3
    =(x+5)(x^2-5x+25)
    8,
    x^3-8
    =x^3-2^3
    =(x-2)(x^2+2x+4)
    9,
    64-x^3
    =4^3-x^3
    =(4-x)(16+4x+x^2)
    10,
    125-x^3
    =5^3-x^3
    =(5-x)(25+5x+x^2)
    11,
    8x^3-y^3
    =(2x)^3-y^3
    =(2x-y)(4x^2+2xy+y^2)

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $3) x^{3} + 8= (x+2)(x^2-2x+2^2) $ 
    $4) x^{3} + 64=(x+4)(x^2-4x+4^2)$
    $5) x^{3} + 125=(x+5)(x^2-5x+5^2)$
    $8) x^{3} – 8=(x-2)(x^2+2x+2^2)$
    $9) 64 – x^{3} =(4-x)(4^2+4x+x^2)$
    $10)125 – x^{3} =(5-x)(5^2+5x+x^2)$
    $11)8x^3- x^{3} =(2x-x)(4x^2+2x^2+x^2)$

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222-9+11+12:2*14+14 = ? ( )